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CICS ADDRESS SET - Address Assignment

CICS ADDRESS SET provides address assignment capabilities in CICS environments. It enables programs to set addresses, manage address operations, and handle address assignment for memory management and data access purposes.

Command Syntax

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       EXEC CICS ADDRESS SET
            [COMMAREA(commarea-address)]
            [EIB(eib-address)]
            [TASK(task-address)]
            [RESP(response-code)]
            [RESP2(response-code-2)]
       END-EXEC.

Parameters

COMMAREA(commarea-address)

Specifies the address to be assigned to the communication area. This parameter sets the COMMAREA address for data exchange operations.

EIB(eib-address)

Specifies the address to be assigned to the Execute Interface Block. This parameter sets the EIB address for system information access.

TASK(task-address)

Specifies the address to be assigned to the task control block. This parameter sets the task address for task management operations.

RESP(response-code)

Specifies the response code variable to receive the operation result. This parameter provides error handling and status information.

RESP2(response-code-2)

Specifies the secondary response code variable for additional error information. This parameter provides extended error details when available.

Address Assignment Types

Communication Area Assignment

ADDRESS SET assigns communication area addresses, enabling programs to establish data exchange channels between transactions and programs.

Execute Interface Block Assignment

The command assigns EIB addresses, providing access to system information, transaction details, and execution context for programs.

Task Control Block Assignment

Task address assignment enables access to task-specific information and control structures for task management and monitoring.

System Control Block Assignment

System control block assignment provides access to CICS system information and control structures for system operations.

Programming Examples

Basic Address Assignment

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       WORKING-STORAGE SECTION.
       01  COMMAREA-ADDR     POINTER.
       01  EIB-ADDR          POINTER.
       01  TASK-ADDR         POINTER.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS ADDRESS SET
                COMMAREA(COMMAREA-ADDR)
                EIB(EIB-ADDR)
                TASK(TASK-ADDR)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Addresses set successfully'
               DISPLAY 'COMMAREA address set to: ' COMMAREA-ADDR
               DISPLAY 'EIB address set to: ' EIB-ADDR
               DISPLAY 'Task address set to: ' TASK-ADDR
           ELSE
               DISPLAY 'Error setting addresses: ' RESPONSE-CODE
           END-IF.

Communication Area Setup

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       WORKING-STORAGE SECTION.
       01  COMMAREA-ADDR     POINTER.
       01  COMMAREA-DATA     PIC X(100).
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  DATA-LENGTH       PIC S9(8) COMP VALUE 100.
 
       PROCEDURE DIVISION.
           EXEC CICS ADDRESS SET
                COMMAREA(COMMAREA-ADDR)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               IF COMMAREA-ADDR NOT = NULL
                   SET ADDRESS OF COMMAREA-DATA TO COMMAREA-ADDR
                   MOVE 'Hello from CICS program' TO COMMAREA-DATA
                   DISPLAY 'COMMAREA address set and data initialized'
                   DISPLAY 'Data: ' COMMAREA-DATA
               ELSE
                   DISPLAY 'COMMAREA address not available'
               END-IF
           ELSE
               DISPLAY 'Error setting COMMAREA address: ' RESPONSE-CODE
           END-IF.

EIB Information Setup

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       WORKING-STORAGE SECTION.
       01  EIB-ADDR          POINTER.
       01  EIB-DATA.
           05  EIBTRNID      PIC X(4).
           05  EIBTASKN      PIC S9(8) COMP.
           05  EIBDATE       PIC S9(8) COMP.
           05  EIBTIME       PIC S9(8) COMP.
           05  EIBRESP       PIC S9(8) COMP.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS ADDRESS SET
                EIB(EIB-ADDR)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               IF EIB-ADDR NOT = NULL
                   SET ADDRESS OF EIB-DATA TO EIB-ADDR
                   DISPLAY 'EIB address set successfully'
                   DISPLAY 'Transaction ID: ' EIBTRNID
                   DISPLAY 'Task number: ' EIBTASKN
                   DISPLAY 'Date: ' EIBDATE
                   DISPLAY 'Time: ' EIBTIME
                   DISPLAY 'Response code: ' EIBRESP
               ELSE
                   DISPLAY 'EIB address not available'
               END-IF
           ELSE
               DISPLAY 'Error setting EIB address: ' RESPONSE-CODE
           END-IF.

Error Handling

Response Code 0

Successful address assignment. The requested addresses have been successfully assigned and are ready for use.

Response Code 8

Invalid address assignment. The specified address assignment is invalid or not supported in the current context.

Response Code 12

Address assignment failed. The address assignment operation failed due to system conditions or resource limitations.

Response Code 16

Invalid address format. The address format is invalid or incompatible with the current system configuration.

Response Code 20

Address assignment error. The address assignment operation encountered an unexpected error condition.

Performance Considerations

Address Assignment Efficiency

ADDRESS SET efficiently assigns addresses, but frequent address assignment operations may impact system performance.

Memory Management

Proper memory management ensures efficient address assignment and prevents memory access violations.

Address Validation

Address validation ensures that assigned addresses are valid and safe to use for memory access operations.

Best Practices

Error Handling

Always check response codes and handle errors appropriately, especially for address assignment validation and system conditions.

Address Validation

Validate assigned addresses before use to ensure they are not null and point to valid memory locations.

Memory Safety

Ensure memory safety when accessing data through assigned addresses to prevent memory access violations.

Address Management

Manage assigned addresses efficiently and avoid unnecessary address assignment operations to optimize performance.

Explain It Like I's 5 Years Old

Imagine you're setting up your room and you want to put your toys in specific places. CICS ADDRESS SET is like telling the computer exactly where to put your toys so you can find them later.

The COMMAREA address is like telling the computer where to put your special message box. The EIB address is like telling it where to put your information folder. The task address is like telling it where to put your activity box.

Just like you need to make sure you put your toys in safe places, the program needs to make sure it puts the addresses in safe places where they won't get lost.

Exercises

Exercise 1: Basic Address Assignment

Write a program that uses ADDRESS SET to assign COMMAREA, EIB, and task addresses and verify the assignments.

Exercise 2: Communication Area Setup

Create a program that sets up a communication area address and initializes data in the communication area.

Exercise 3: EIB Information Management

Implement a program that sets up EIB address assignment and processes execution interface block information.

Related Concepts

CICS Memory Management

Understanding CICS memory management and addressing

CICS Communication Areas

Learning about CICS communication areas and data exchange

CICS Execute Interface Block

Understanding CICS EIB and system information access

CICS Error Handling

Learning about CICS error handling and response codes